Power transmission

Details Power transmission Power transmission

1989-01-10

1990-08-21

Michalsky, Gerald A.

Fluid handling

Processes

13762565, F15B 13044

Patent

active

049497413

ABSTRACT:
A method of controlling spool shift speed in a solenoid operated hydraulic directional valve which includes a body, a spool slidably mounted in a bore in the body and operable to control hydraulic fluid flow, a force controlled solenoid adapted to be electrically energized by a constant current supply and a spring yieldingly urging the valve spool to a predetermined position, which method comprises applying a constant force by energizing the solenoid with a constant current to the spool valve which opposes the linearly increasing force of the spring thereby decelerating the shifting action of the spool.

REFERENCES:
patent: 4373697 (1983-02-01), Phelps
patent: 4456434 (1984-06-01), El Ibiary

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